1 php
2 //1. 图片背景管理
3 /* imagecreatefromjpeg($filename) 从jpeg文件或者url新建一图像
4 * imagecreatefrompng($filename) 从png文件或者url新建一图象
5 * imagecreatefromgif($filename) 从gif文件或者url新建一图像
6 * 用完之后要用imagedestroy()函数进行销毁
7 * getimagesize($filename) 返回数组,0宽1高,2类型(1GIF,2JPG,3PNG,4SWF..),3是可用于img标记的文本字符串(height="x" width="y")
8 */
9 //该方法用于自动识别类型并打开图片,使用传入的func函数操作图片,vars是参数列表
10 //如果返回的是不是原image,要在func中摧毁image
11 function imagego($filename, $func, $vars){
12 list($width, $height, $type, $attr) = getimagesize($filename);
13 $types = array(1=>"gif", 2=>"jpeg", 3=>"png");
14 //组合创建图像函数名
15 $createfrom = "imagecreatefrom".$types{$type};
16 $image = $createfrom($filename);
17 //对该图片进行操作
18 $image = $func($image, $width, $height, $type, $vars);
19 //组合输出图像函数名
20 $output = "image".$types{$type};
21 $filename_s = preg_split("/\./", $filename);
22 $filename = $filename_s{0}."_${func}.".$filename_s{1};
23 $output($image, $filename);
24
25 imagedestroy($image);
26 }
27 //该方法用于在图片上加上字符串,传入一个参数表示添加的字符串
28 function imageaddstring($image, $width, $height, $type, $vars){
29 $string = $vars{0};
30 $sx = ($width - imagefontwidth(5)*strlen($string))/2;
31 $sy = ($height - imagefontheight(5))/2;
32 $textcolor = imagecolorallocate($image, 255, 0, 0);
33 imagestring($image, 5, $sx, $sy, $string, $textcolor);
34 return $image;
35 }
36 imagego("img/1.jpg", "imageaddstring", array("Add a string on JPEG"));
37 imagego("img/2.gif", "imageaddstring", array("Add a string on GIF"));
38 imagego("img/3.png", "imageaddstring", array("Add a string on PNG"));
39
40 //2. 图片缩放与裁剪处理
41 /* imagecopyresized
42 * imagecopyresampled($dst_img.$src_img,$dst_x,$dst_y,$src_x,$src_y,$dst_w,$dst_h,$src_w,$src_h)
43 * 以上两个函数都可以进行图片缩放,后者效果好一些.该函数可以在图像内部复制,但当区域重复时后果不可知
44 * 如果源和目标的高宽不一样,则会自动进行缩放.
45 * 同时,该函数也可以实现图像的裁剪.
46 */
47 //该方法用于缩小图片1.5倍
48 function imagethumb($image, $width, $height, $type, $vars){
49 $p = $vars{0};
50 $n_image = imagecreatetruecolor($width/$p, $height/$p);
51 imagecopyresampled($n_image, $image, 0, 0, 0, 0, $width/$p, $height/$p, $width, $height);
52 imagedestroy($image);
53 return $n_image;
54 }
55 imagego("img/1.jpg", "imagethumb", array(1.5));
56 imagego("img/2.gif", "imagethumb", array(1.5));
57 imagego("img/3.png", "imagethumb", array(1.5));
58 //该方法用于实现图片的裁剪
59 function imagecut($image, $width, $height, $type, $vars) {
60 $n_x = $vars{0};
61 $n_y = $vars{1};
62 $n_width = $vars{2};
63 $n_height = $vars{3};
64
65 $n_image = imagecreatetruecolor($n_width, $n_height);
66 imagecopyresampled($n_image, $image, 0, 0, $n_x, $n_y, $n_width, $n_height, $n_width, $n_height);
67 imagedestroy($image);
68 return $n_image;
69 }
70 imagego("img/1.jpg", "imagecut", array(200, 100, 100, 100));
71 imagego("img/2.gif", "imagecut", array(200, 100, 100, 100));
72 imagego("img/3.png", "imagecut", array(200, 100, 100, 100));
73
74 //3. 添加图片水印
75 /* imagecopy($dst_img,$src_img,$dst_x,$dst_y,$src_x,$src_y,$src_w,$src_h)
76 * 将一个图片复制到另一个图片上面
77 */
78 function watermark($image, $width, $height, $type, $vars){
79 $w_image = imagecreatefrompng("img/logo.png");
80 list($src_w, $src_h) = getimagesize("img/logo.png");
81 imagecopy($image, $w_image, $vars{0}, $vars{1}, 0, 0, $src_w, $src_h);
82 imagedestroy($w_image);
83 return $image;
84 }
85 imagego("img/1.jpg", "watermark", array(50,50));
86 imagego("img/2.gif", "watermark", array(100,100));
87 imagego("img/3.png", "watermark", array(150,150));
88
89 //4. 图片的选装和翻转
90 /* imagerotate($src,$degree,$bgcolor,[ignore transparent]) 可选参数是否忽视透明色,返回旋转后的图片
91 * 翻转用imagecopy按像素行或者像素列复制就可以了
92 * 下面的函数先旋转再翻转
93 */
94 function rotateandturn($image, $width, $height, $type, $vars) {
95 $angle = $vars{0};
96 $image = imagerotate($image, $angle, 0);
97 //选装后图片大小可能发生变化
98 $width = imagesx($image);
99 $height = imagesy($image);
100 $n_image = imagecreatetruecolor($width, $height);
101 //1代表x轴翻转,2代表y轴翻转,0代表不翻转
102 if ($vars{1} == 1) {
103 for ($x = 0; $x < $width; $x++) {
104 imagecopy($n_image, $image, $x, 0, $width-$x-1, 0, 1, $height);
105 }
106 } else if ($vars{1} == 2){
107 for ($x = 0; $x < $height; $x++) {
108 imagecopy($n_image, $image, 0, $x, 0, $height-$x-1, $width, 1);
109 }
110 } else {
111 imagecopy($n_image, $image, 0, 0, 0, 0, $width, $height);
112 }
113
114 imagedestroy($image);
115 return $n_image;
116 }
117 imagego("img/1.jpg", "rotateandturn", array(10, 0));
118 imagego("img/2.gif", "rotateandturn", array(0,1));
119 imagego("img/3.png", "rotateandturn", array(10,2));
120 ?>
121
122
123 原图
124124 @@##@@@@##@@@@##@@
125
图中添加字符串
126 @@##@@@@##@@@@##@@
127
图片缩放
128 @@##@@@@##@@@@##@@
129
图片裁剪
130 @@##@@@@##@@@@##@@
131
图片水印
132 @@##@@@@##@@@@##@@
133
图片旋转和翻转
134 @@##@@@@##@@@@##@@
135
136
137 PHP学习笔记10GD图片处理
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